CN1985109B

CN1985109B - Shift point strategy for hybrid electric vehicle transmission

Info

Publication number: CN1985109B
Application number: CN2005800229607A
Authority: CN
Inventors: G·A·布鲁纳曼; L·J·布拉克尼
Original assignee: Eaton Corp
Current assignee: Eaton Intelligent Power Ltd
Priority date: 2004-07-07
Filing date: 2005-07-07
Publication date: 2010-10-27
Anticipated expiration: 2025-07-07
Also published as: EP1781967A2; US7463962B2; CA2573111C; US20060006008A1; CN1985109A; WO2006014539A3; CA2573111A1; BRPI0512770A; WO2006014539A2

Abstract

A method for determining a shift point strategy in a hybrid vehicle includes providing at least two power sources, selectively coupling the two or more power sources to a hybrid vehicle transmission, defining an input shaft speed for best acceleration, defining an input shaft speed for best fuel economy, determining driver intent compared to the best acceleration and the best fuel economy, and setting a shift point of the hybrid vehicle transmission based, at least in part, on the driver intent.

Description

The shift point strategy that is used for hybrid electric vehicle transmission

Association request

It is 60/585 that the application advocates to apply for July 7, sequence number in 2004,896, denomination of invention is the preference of the temporary patent application of " Shift Point Strategy for Hybrid Electric VehicleTransmission ", and this application is contained in its full content in this specification by reference.

Technical field

System and method of the present invention relates generally to hybrid motor vehicle, relates to the system and method that is used for setting up shift point strategy in hybrid motor vehicle particularly.

Background technique

Car manufactures is constantly made great efforts to improve the fuel economy of Motor Vehicle.To the improvement of fuel economy be usually directed to weight saving, aerodynamic improvements, power input change, and reduce kinetic equation loss by vehicle engine assembly.But, can be provided improved comfort level, power usually, reach demand counteracting vehicle driver's convenience to the demand of improved fuel economy.For example, because lower supplementary loss, manual transmission is better than automatic transmission aspect fuel economy.But because automatic transmission provides improved driver's convenience, what for example most domestic Motor Vehicle were equipped with all is automatic transmission.

In being equipped with the Motor Vehicle of automatic transmission, can be to regulating the opportunity of gear shift with the fuel consume characteristic that changes vehicle, and acceleration characteristic etc.Traditionally, be identified for gear shift progress chart in the control apparatus of automatic transmission in the development of vehicle, with the shift point of setting up speed changer based on the fuel consume characteristic and the acceleration characteristic of motor.According to this method, because can read the required data of control, so can control the shift characteristic of speed changer in real time by computer with low computational speed from the gear shift progress chart.

But in recent years, the vehicular manufacturer is making great efforts research and development " mixed power " electric motor car, and it comprises internal-combustion engine and electric motor or oil hydraulic motor, with the pollutant compared to traditional combustion engine discharging reduced levels.In recent years Yan Fa use motor and motor wherein the capability list of the hybrid-power electric vehicle of one or both reveal much problems about research and development transmission gear change point strategy.Particularly, because use a plurality of uncertainties that vehicle driveline provides torque to bring that are input as usually, it is more difficult that hybrid vehicle is formed predetermined gear shift point diagram.

Summary of the invention

A kind of method that is used for determining shift point strategy comprises: two power sources are provided at least; The hybrid vehicle speed changer that optionally will have input shaft is coupled to described at least two power sources, described hybrid vehicle speed changer at least one reception power from described power source; Be defined for the speed of the described transmission input shaft of best acceleration; Be defined for the speed of the described transmission input shaft of optimal fuel economy; By with described best acceleration and described optimal fuel economy relatively come to determine driver intention; And set shift point based on described determining step to small part.

A kind of example system that is used for the shift strategy of definite hybrid gearbox, described system comprises control unit, it is constructed to be defined for the speed of the described hybrid gearbox input shaft of best acceleration, be defined for the speed of the described transmission input shaft of optimal fuel economy, to small part based on as the percentile driver requested torque that all can obtain torque, by with described best acceleration and described optimal fuel economy relatively come to determine driver intention, and set shift point based on described determining step to small part.

Description of drawings

With reference to accompanying drawing, in the mode of example the embodiment of system and method for the present invention is described, wherein:

Fig. 1 is the schematic representation that is used for the mixed power power assembly of Motor Vehicle;

Fig. 2 is a flow chart, shows the method that is used for determining hybrid vehicle automatic gearbox gear shifting point according to an exemplary embodiment;

Fig. 3 is a flow chart, shows the method that is used for the assess driver intention and regulates shift point in response to driver intention according to an exemplary embodiment;

Fig. 4 shows the chart according to the shift point strategy of realizing of an exemplary embodiment in hybrid vehicle.

In whole accompanying drawings, the same reference numerals representation class is like (but not necessarily identical) element.

Embodiment

With reference to figure 1, show mixed power power assembly system 20 according to the embodiment of system and method for the present invention.In the illustrated embodiment, power assembly system 20 comprises first tractor 22 and the hybrid gearbox 24 such as spark ignition or compression-ignition engine, and hybrid gearbox 24 comprises second tractor 26 such as motor/generator or hydraulic motor/pump.Main timing clutch 28 is arranged between first tractor 22 and the hybrid gearbox 24 optionally first tractor 22 be engaged to hybrid gearbox 24 or separate from hybrid gearbox 24.Main timing clutch 28 can be the clutch (such as hydraulic pressure or electronic friction clutch) of the current known any amount in related domain.In this specification and claims, when being relevant to clutch and mentioning term " joint ", its should be understood that to cause folk prescription to or the clutch connecting moves of twocouese realize.Similarly, the operation in " separation " pattern should be understood that to allow freely to be rotated on one or two sense of rotation by transmission element.

Again with reference to figure 1, power assembly system 20 can comprise the electronic control unit (ECU) 30 of the operation that is used to control first tractor 22, second tractor 26, main clutch 28 and hybrid gearbox 24.Specifically textural, ECU 30 comprises programmable digital computer, it is configured to receive various input signals (including but not limited to motion speed, speed changer input speed, selected transmission ratio, speed changer output speed and the speed of a motor vehicle of first tractor 22 and second tractor 26), handles the operation that these signals are controlled power assembly system 20 according to logic rules then.For example, can do the time spent with fuel delivery to the first tractor 22 with what play internal-combustion engine at first tractor to ECU 30 programming.In order to support above-mentioned control, each in first tractor 22, second tractor 26, main clutch 28 and the hybrid gearbox 24 all can comprise the

controller

32,33,34 and 36 of himself respectively.But, it should be understood that system and method for the present invention is not limited to any particular type or the structure of ECU 30,

controller

32,33,34 and 36, also be not limited to be used for any concrete control logic of the operation of dynamics of management assembly system 20.

In exemplary embodiment shown in Figure 1, power assembly system 20 comprises that also at least one is used to energy is provided so that the energy storing device 38A of first tractor 22 and the running of second tractor 26 38B.For example, when the time spent of doing of 22 internal-combustion engines of first tractor, the energy storing device 38A that is communicated with first tractor, 22 fluids can hold hydrocarbon fuel.In another example, when the time spent of doing of 26 motor/generators of second tractor, energy storing device 38B can wrap storage battery, battery pack or capacitor.When such structure, as known in the art, motor/generator 26 can be set pass through to drive inverter 39 electrical communication with electrical energy storage device 38B.Perhaps, when the time spent of doing of 26 hydraulic motor/pumps of second tractor, energy storing device 38B can play hydraulic accumulator.

According to an exemplary embodiment, hybrid gearbox 24 is coupled to the output of first tractor 22 by the main timing clutch 28 that is coupled to first tractor 22.Similarly, hybrid gearbox 24 is coupled to second tractor 26.According to an exemplary embodiment, first tractor 22 and second tractor 26 both all can be independently or drive hybrid gearbox 24 simultaneously.According to an exemplary embodiment, hybrid gearbox 24 can comprise and is constructed to allow by first tractor 22 and second tractor 26 respectively to speed changer the gear train of any amount independent and that drive simultaneously (comprise but never be limited to the planetary gear set (not shown)).In addition, hybrid gearbox 24 can comprise the transmission input shaft that is connected to many velocity ratios speed changer.Many velocity ratios speed changer can comprise several changeable velocity ratios (as visible in the shift transmission known in this field of any amount), or comprises more not traditional power-transmission system such as stepless speed variator (" CVT ").

Go out as shown, ECU 30 can controllably be coupled to hybrid gearbox to receive and to explain that a plurality of torques, inertia and speed input are to determine transmission gear change point and relatively to send shift command based on speed changer turbine trip speed and the shift point of determining.According to an exemplary embodiment, the ECU 30 that illustrates comprises the computer based on microprocessor, this computer is with the programming of a plurality of non-fuzzy logic rules and membership function, these rules and function and determine transmission gear change point based on several conditions (including but not limited to the inputs of torque, inertia and speed).In addition, ECU 30 can comprise shift logic module and control module, this shift logic module structure is for based on relatively sending the signal that upgrades and lower category between existing speed changer turbine trip speed and the definite shift point, and this control module is used to carry out the clutch operating that is associated with required scope gear shift.Below will describe the details of the operating method of ECU 30 in detail.

As mentioned above, the conventional truck that comprises single tractor can have the shift point of gear shift progress chart with the required combination of determining to provide fuel economy and acceleration.But,, be more complicated so dynamically set up required shift point strategy because in more complicated mixed power power assembly system 20, used a plurality of tractors.The mixed power power assembly system receives the torque input from least two usable power sources.The torque that can be provided by a plurality of tractors in mixed power power assembly system 20 and the variable amount of power and combination make can not use the gear shift progress chart.Therefore, system and method for the present invention uses the non-fuzzy logic to determine suitable shift point based on a plurality of inputs and vehicle-state.Below will provide and to comprise to determine the example system of shift point in the hybrid vehicle and the details of method by ECU 30.

Fig. 2 shows according to an exemplary embodiment, is comprised to come the illustrative methods of determining a plurality of shift point and in time carry out gear shift in hybrid vehicle by ECU 30.As shown in the figure, this illustrative methods starts from first setting up a plurality of shift point (step 200) based on a plurality of data and to this data application non-fuzzy logic.In case set up shift point, just behind the shift point of determining, increased lag behind (step 210).Then, as shown in Figure 2, to small part based on a plurality of operational conditions and to the non-fuzzy logic should be used for select nominal gear (nominal gear) (step 220) and select final gear (final gear) (step 230) based on trigger condition.According to an exemplary embodiment, be used for being repeated to carry out to be consistent with the vehicle operating condition that changes in the above-mentioned illustrative methods that hybrid vehicle is determined a plurality of shift point and in time carried out gear shift.The details of above-mentioned illustrative methods is described with reference to Fig. 3 and Fig. 4.

As mentioned above, be used for starting from first based on data accumulation and using non-fuzzy logic to these data and set up a plurality of shift point (step 200) in this illustrative methods that hybrid vehicle is determined shift point and in time carried out gear shift.Fig. 3 shows the illustrative methods that is used for determining shift point according to an exemplary embodiment.As shown in Figure 3, be used for determining that in hybrid vehicle the illustrative methods of shift point starts from first defining the target input shaft speed (step 300) that is used for best acceleration.Traditionally, high input shaft speed can provide best acceleration.According to this exemplary embodiment, the target input shaft speed that is used for best acceleration is determined and can be by from the input of internal-combustion engine, produces from the input of alternative fuel source (such as fuel cell or storage battery that electric energy is provided to motor) or from the input of the combination in internal-combustion engine and alternative fuel source.

According to an exemplary embodiment, determine that with the synthetic peak torque curve of second tractor 26 (Fig. 1) each gear of this hybrid gearbox 24 (Fig. 1) is used for the input shaft speed of the shift point of best acceleration (high point) by analyzing as first tractor 22 (Fig. 1) of function of speed.Draw this curve to obtain effective peak torque for each velocity ratio then at transmission output shaft place hybrid electric drive system as function of speed.According to this exemplary embodiment, analyze this curve then, make that when when the condition operation of best acceleration is provided hybrid gearbox is kept engagement until in approaching value torque on the selecteed gear is identical with the next one of the torque on the current gear.If infeasible, it is high as much as possible then will to provide the high input shaft speed point selection of best acceleration to get in the mechanical limit of hybrid gearbox 24 (Fig. 1) and Power Train, simultaneously driver's work efficiency factor (noise) is maintained normal level.For example, as shown in Figure 4, first gear has the shift-up point (400) of the mechanical upper limit of expression hybrid gearbox.The input shaft speed that surpasses the mechanical upper limit may cause damaging hybrid gearbox 24 (Fig. 1).

In addition, according to illustrative methods shown in Figure 3, native system determines to produce the target input shaft speed (step 310) of optimal fuel economy.According to this exemplary embodiment, the target input shaft speed that is used for optimal fuel economy can be from internal-combustion engine, from determining such as the alternative fuel source of fuel cell or storage battery or from the combination in internal-combustion engine and alternative fuel source of electric energy is provided to motor.

According to an exemplary embodiment, when first tractor 22 that is embodied as internal-combustion engine when being enough to prevent the steady state running of engine stall, the maximum fuel Economy of hybrid vehicle can be provided.Therefore, as the result of the combination that both import from first tractor 22 (Fig. 1, it is as internal-combustion engine) and second tractor 26 (Fig. 1, it utilizes the alternative fuel source, for example it be a motor), can obtain to be used for the target input shaft speed of optimal fuel economy.According to this exemplary embodiment, can calculate the target input shaft speed that is used for optimal fuel economy as by the ratio with first tractor 22 (Fig. 1) power that provided of steady state running such as internal-combustion engine, the power input of second tractor 26 (Fig. 1) by the change motor form increases and reduces the speed of input shaft simultaneously.

Though by operating first tractor 22 (Fig. 1) and second tractor 26 (Fig. 1) with alap motion speed to realize the maximum fuel Economy, the shift point that is used for optimal fuel economy is set so that vehicle can accelerate to the next gear of hybrid gearbox 24 (Fig. 1) continuously.According to an exemplary embodiment, can be based on being used for first tractor, 22 (Fig. 1, as internal combustion engine operation) fuel-economy linearity curve and the efficiency curve adjustment of second tractor 26 (Fig. 1, as motor operation) the target input shaft speed that is used for optimal fuel economy.Under most of situation, two kinds of systems all may motion speed show optimal fuel economy minimum.In addition, according to an exemplary embodiment, can be the shift point set up of optimal fuel economy and best acceleration to improve the impression of operator when changing grade from absolute optimum value slight modification.This may be the problem of vehicle application and target capabilities demand side.According to an exemplary embodiment, can change the shift-up point 400 among Fig. 4 and lower category a little 410 to improve operator's impression.

No matter the tractor combination that is used to form extreme fuel economy and acceleration how, the target input shaft speed that is used for the target input shaft speed of best acceleration and is used for optimal fuel economy is respectively the shift point of acquisition and has set up CLV ceiling limit value and lower limit.In case determined these extreme shift point parameters, just assessment show driver intention a plurality of states to change the position of the shift point that obtains, allow thus vehicle provide safety, effectively, and reactive the driving.

As shown in Figure 3, can select from extreme Variation shift point (step 320) by analyzing the gear indication.According to an embodiment, if gear indication is to place common driving (D) or hypervelocity gear, with regard to the supposition driver more take notice of fuel economy and acceleration and/or torque generate may be not too important.Therefore, according to an exemplary embodiment, detect gear indication be positioned at that common driving (D) or hypervelocity (OD) gear will show need be with the shift point that obtains to for providing the definite low input shaft speed of optimal fuel economy to regulate.On the contrary, be in respect to drive (D) or hypervelocity (OD) more the gear indication of low-grade location (such as low-grade location (L) or specific low-grade location (1,2,3)) may represent acceleration and the torque usability that the user need improve.Therefore, than common driving (D) or hypervelocity (OD) gear more the gear indication of low-grade location will be interpreted as and shift point need be regulated to allow to generate bigger acceleration and/or torque to high input shaft speed, be cost with possible fuel economy simultaneously.

Another state that can check for the shift point that changes acquisition is the torque percentaeg (step 330) of the current use of vehicle.According to an exemplary embodiment, the torque percentaeg of vehicle is defined as requiring amount of torque divided by the obtainable amount of torque of current range state.According to torque is percentile should definition, to by in first tractor and second tractor any one or both provided that possible torque input is assessed, to determine at the obtainable amount of torque of current gear.Particularly, ECU determines the current gear of speed changer and this gear be multiply by by possible the torque that both provide by first tractor 22 (Fig. 1) and second tractor 26 to import.According to this exemplary embodiment, if the vehicle user is requiring the most torque that obtains, then this requirement is interpreted as the demand to high rate of acceleration.Therefore, will make synthetic shift point regulate near 1.0 torque percentaeg to high input shaft speed.

According to an exemplary embodiment, use the torque percentaeg to come the calculating torque order factor, can use this factor to regulate shift point then.The realization of the torque command factor comprised based on the torque percentaeg be created in the factor between 0 and 1, wherein 1 expression maximum acceleration shift point is selected, and the best MPG shift point of 0 expression is selected.This factor depends on that current demand torque can obtain the ratio of torque and depend on the apparent inertia of current vehicle with maximum.Use the torque command factor dynamically to regulate shift point then with other analyzed factors.

Except above-mentioned state, this example system is also assessed the shift point of the apparent inertia (step 340) of vehicle with further adjusting acquisition.The shift point of having relatively high expectations usually than heavy duty with tall vehicle inertia is to keep the speed that needs.According to an exemplary embodiment, can calculate the apparent inertia of vehicle divided by vehicle acceleration by the transmission output shaft torque.Can determine the transmission output shaft torque according to the illustrative methods of any amount.According to an exemplary embodiment, can be by first tractor 22 (Fig. 1) be determined output shaft torque in the Calais mutually with second both output torques of tractor 26 (Fig. 1).In order to obtain the torque of first tractor 22 (Fig. 1), can detect the throttle opening that shows engine condition usually by throttle sensor.Throttle opening and engine speed can be compared then, and compare to determine the torque of first tractor 22 (Fig. 1) with the outputting power performance plot by ECU 30 (Fig. 1).Similarly, in order to determine the output torque of second tractor 26 (Fig. 1), the energy that can obtain to import in second tractor is imported and this energy input is compared with output characteristics figure.

Similarly, can use the known method of any amount to determine the acceleration of vehicle.According to an exemplary embodiment, determine vehicle acceleration by the transmission output shaft speed of at first measuring hybrid gearbox 24 (Fig. 1).According to an exemplary embodiment, can by traditional electronic sensor (such as potentiometer, thermistor, and magnetic speed pick-up) obtain current mixed power system speed.ECU 30 (Fig. 1) can use these inputs to produce the speed numerical value of current mixed power system then.In case measured the speed of transmission output shaft, just calculated acceleration with time inverse as the output speed of measuring.Can use acceleration and torque to determine the apparent inertia of vehicle then.Using before acceleration and torque data determine the apparent inertia of vehicle, can be according to an embodiment with this data digital filtering with the removal noise effect.Can use apparent inertia to show because peripheral situation of vehicle when (including but not limited to than heavy load, such as the relatively poor condition of road surface or the abrupt slope of mud ground) needs the shift point that raises.According to an exemplary embodiment, the apparent inertia of vehicle plays similar multiplier for the torque percentaeg, and vehicle is adjusted to higher shift point in proportion and empty wagons is adjusted to lower shift point in proportion bigger car weight.

Then with reference to figure 3,, just can determine to upgrade and lower category point (step 350) for current running state in case collect definite gear, torque percentaeg and apparent inertia.According to an exemplary embodiment, regulating by the target input shaft speed according to the performance of the inertia of vehicle and vehicle operators demand is the limiting value that best acceleration and optimal fuel economy are set up, and the performance of vehicle operators demand can show by employed torque percentaeg and the gear determined.

Except because the gear of determining, torque percentaeg, and apparent inertia regulate the shift point, also can regulate shift point (step 210) based on lagging behind.Particularly, during carrying out gear and changing, to gather way offset and deduct velocity compensated value of each shift-up point from each downshift position.This computational speed offset is initialised when gear shift begins immediately, and descends with computation rate.Shift hysteresis is set to avoid the limit value circulation.

Fig. 4 shows to each gear and is plotted as the mixed power input shaft speed to the minimum and maximum shift-up point of hybrid gearbox input shaft speed and lower category a little.As shown in Figure 4, can change widely corresponding to the axle speed that upgrades in the hybrid vehicle and lower category for each optional gear.Therefore, above-mentioned regulatory factor can have great influence to the fuel economy and the acceleration characteristic of hybrid vehicle.Therefore, as shown in Figure 4, can recently select to upgrade and lower category a little than the transmission between the low-grade location based on the gear and a higher gear that is used to upgrade of current running and a little one of being used to lower category.According to this exemplary embodiment, consider current gear and the velocity ratio between the gear on every side make when input shaft speed relative with output shaft speed near the time, can carry out gear engagement, reduce the wearing and tearing on the gear during execution upgrades or lowers category thus greatly.

Return Fig. 2, in case dynamically set up shift point according to said method, the nominal gear (step 220) of hybrid vehicle with regard to selecting to be used to operate.According to an exemplary embodiment, select nominal gear based on transmission output shaft speed.According to the shift point strategy of setting up,, just be chosen in and allow the gear that necessarily advances before requiring under the current state to lower category in case detect transmission output shaft speed.

When having selected nominal gear (step 220), can select final gear based on the shift point strategy of setting up.According to an exemplary embodiment, when in hybrid gearbox 24 (Fig. 1), carrying out according to the shift point of setting up, adopt initiatively shift mode from the upgrading and lower category of nominal gear.

According to an exemplary embodiment, in hybrid vehicle, continue to carry out this method dynamically to upgrade shift point strategy.In addition, can during actual gear shift, carry out this method,, then will upgrade notch command to react new operator's intention if take place thus excessively to slow down or quicken.

Specifically illustrated and described example system of the present invention and method with reference to the foregoing description, it only is an example of implementing the optimal mode of native system and method.What it will be appreciated by those skilled in the art that is the embodiment to system and method described herein to make various changes and not break away from spirit of the present invention and the scope that is defined in the claims when implementing native system and/or method.Claims are intended to define the scope of native system and method, so fall into these claims and the system and method that is equal to it can be contained.Above description to native system and method should be understood to include whole combination new and non-obvious element described herein, and can have the claim that relates to any combination new and non-obvious element in the application or the subsequent application.In addition, the foregoing description is exemplary, and in whole may the combination that can be claimed in the application or subsequent application, single feature of neither one or element are absolutely necessary.

Claims

1. method that is used for determining shift point strategy comprises:

At least two power sources are provided;

The hybrid vehicle speed changer that optionally will have input shaft is coupled to described at least two power sources, and described hybrid vehicle speed changer receives power from described power source;

Be defined for the speed of the described transmission input shaft of best acceleration;

Be defined for the speed of the described transmission input shaft of optimal fuel economy;

By with described best acceleration and described optimal fuel economy relatively come to determine driver intention; And

Set shift point based on described determining step to small part;

Described by the step of relatively coming to determine driver intention with described best acceleration and described optimal fuel economy comprise assessment gear indication with select in described best acceleration and the described optimal fuel economy both one of.

2. the method for claim 1, wherein:

Described determining step comprises the percentile driver requested torque that uses as all obtaining torque.

3. method as claimed in claim 2, wherein:

Describedly all can obtain torque and comprise summation from the obtained torque of described at least two power sources.

4. the method for claim 1 also comprises:

Determine the apparent inertia of vehicle; And

Use described definite apparent inertia of vehicle to regulate the indication of at least one shift point as needs.

5. method as claimed in claim 4, the step of the apparent inertia of wherein said definite vehicle comprises:

Measure the output shaft torque of described hybrid vehicle speed changer;

Determine the acceleration of described vehicle; And

With described output shaft torque divided by described vehicle acceleration.

6. the method for claim 1 also comprises:

After gear shift, increase and lag behind so that the limit value circuit requires minimized step.

7. the method for claim 1, wherein:

The described step of setting shift point based on described determining step to small part be included as described hybrid gearbox the gear that engages set shift-up point and lower category a little.

8. the method for claim 1, wherein:

The described step of setting shift point based on described determining step to small part is included as each gear in the described hybrid gearbox and sets shift-up point and lower category a little.

9. method that is used for determining shift point strategy comprises:

At least the first power source and second power source are provided, and wherein said first power source is an internal-combustion engine;

The hybrid vehicle speed changer that optionally will have input shaft is coupled to described at least two power sources, and described hybrid vehicle speed changer is constructed to optionally receive power from described first and second power source at least;

By with described best acceleration and described optimal fuel economy relatively come to determine driver intention, described driver's intention by use apparent inertia as the percentile driver requested torque that all can obtain torque, vehicle, and the Transmission gear indication determine; And

Set shift point based on described determining step to small part.

10. method as claimed in claim 9 also comprises:

After gear shift, increase and lag behind so that the limit value circuit requires to minimize.

11. method as claimed in claim 9, wherein:

12. method as claimed in claim 9, wherein:

13. a method that is used to operate hybrid vehicle comprises:

Set up shift point strategy, the wherein said shift point strategy of setting up may further comprise the steps: at least two power sources are provided; The hybrid vehicle speed changer that optionally will have input shaft is coupled to described at least two power sources, described hybrid vehicle speed changer at least one reception power from described power source; Be defined for the speed of the described transmission input shaft of best acceleration; Be defined for the speed of the described transmission input shaft of optimal fuel economy; By with described best acceleration and described optimal fuel economy relatively come to determine driver intention; And set shift point based on described determining step to small part;

Determine to fall into the middle gear of described shift point strategy; And

Select described middle gear;

14. the method for operation hybrid vehicle as claimed in claim 13, wherein:

15. the method for operation hybrid vehicle as claimed in claim 14, wherein:

16. the method for operation hybrid vehicle as claimed in claim 13 also comprises:

Determine the apparent inertia of vehicle; And

17. the method for operation hybrid vehicle as claimed in claim 16, the step of the apparent inertia of wherein said definite vehicle comprises:

Measure the output shaft torque of described hybrid vehicle speed changer;

Determine the acceleration of described vehicle; And

With described output shaft torque divided by described vehicle acceleration.

18. the method for operation hybrid vehicle as claimed in claim 13 also comprises:

19. as the method for operation hybrid vehicle as described in the claim 13, wherein:

20. as the method for operation hybrid vehicle as described in the claim 13, wherein:

21. system that is used for the shift point strategy of definite hybrid gearbox, described hybrid gearbox has a plurality of tractors that optionally are coupled to input shaft, described system comprises: control unit, it is constructed to be defined for the speed of the described hybrid gearbox input shaft of best acceleration, be defined for the speed of the described transmission input shaft of optimal fuel economy, all can obtain the percentile driver requested torque of torque based on conduct to small part, by with described best acceleration and described optimal fuel economy relatively come to determine driver intention, and set shift point based on described determining step to small part; Wherein determine described driver intention based on the automatic transmission bit representation to small part.

22. system as claimed in claim 21, wherein:

Described control unit also is constructed to determine the apparent inertia of vehicle, and uses described definite apparent inertia of vehicle to regulate the indication of at least one shift point as needs.